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|
package packp
import (
"fmt"
"sort"
"strings"
)
// Capabilities contains all the server capabilities
// https://github.com/git/git/blob/master/Documentation/technical/protocol-capabilities.txt
type Capabilities struct {
m map[string]*Capability
o []string
}
// Capability represents a server capability
type Capability struct {
Name string
Values []string
}
// NewCapabilities returns a new Capabilities struct
func NewCapabilities() *Capabilities {
return &Capabilities{
m: make(map[string]*Capability),
}
}
func (c *Capabilities) IsEmpty() bool {
return len(c.o) == 0
}
// Decode decodes a string
func (c *Capabilities) Decode(raw string) {
params := strings.Split(raw, " ")
for _, p := range params {
s := strings.SplitN(p, "=", 2)
var value string
if len(s) == 2 {
value = s[1]
}
c.Add(s[0], value)
}
}
// Get returns the values for a capability
func (c *Capabilities) Get(capability string) *Capability {
return c.m[capability]
}
// Set sets a capability removing the values
func (c *Capabilities) Set(capability string, values ...string) {
if _, ok := c.m[capability]; ok {
delete(c.m, capability)
}
c.Add(capability, values...)
}
// Add adds a capability, values are optional
func (c *Capabilities) Add(capability string, values ...string) {
if !c.Supports(capability) {
c.m[capability] = &Capability{Name: capability}
c.o = append(c.o, capability)
}
if len(values) == 0 {
return
}
c.m[capability].Values = append(c.m[capability].Values, values...)
}
// Supports returns true if capability is present
func (c *Capabilities) Supports(capability string) bool {
_, ok := c.m[capability]
return ok
}
// SymbolicReference returns the reference for a given symbolic reference
func (c *Capabilities) SymbolicReference(sym string) string {
if !c.Supports("symref") {
return ""
}
for _, symref := range c.Get("symref").Values {
parts := strings.Split(symref, ":")
if len(parts) != 2 {
continue
}
if parts[0] == sym {
return parts[1]
}
}
return ""
}
// Sorts capabilities in increasing order of their name
func (c *Capabilities) Sort() {
sort.Strings(c.o)
}
func (c *Capabilities) String() string {
if len(c.o) == 0 {
return ""
}
var o string
for _, key := range c.o {
cap := c.m[key]
added := false
for _, value := range cap.Values {
if value == "" {
continue
}
added = true
o += fmt.Sprintf("%s=%s ", key, value)
}
if len(cap.Values) == 0 || !added {
o += key + " "
}
}
if len(o) == 0 {
return o
}
return o[:len(o)-1]
}
|
